2. Paleontologists study dinosaur bones.
3. Dig up bones.
4. Dinosaurs built a nest.
5. Some dinosaurs had tail, horn and wings.
6. Temperature is the amount of heat.
7. Reservoirs are man-made lakes.
8. Lakes are areas of water sorrounded by land.
9. A river has three parts: upper course, middle course and lower course.
10. A river is a continuous flow of water.
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